ethers-rs/examples/permit_hash.rs

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use ethers::{
contract::{Eip712, EthAbiType},
core::types::transaction::eip712::Eip712,
types::{Address, U256},
};
// Generate the EIP712 permit hash to sign for a Uniswap V2 pair.
// <https://eips.ethereum.org/EIPS/eip-712>
// <https://eips.ethereum.org/EIPS/eip-2612>
#[derive(Eip712, EthAbiType, Clone)]
#[eip712(
name = "Uniswap V2",
version = "1",
chain_id = 1,
verifying_contract = "0xB4e16d0168e52d35CaCD2c6185b44281Ec28C9Dc"
)]
struct Permit {
owner: Address,
spender: Address,
value: U256,
nonce: U256,
deadline: U256,
}
fn main() {
let permit = Permit {
owner: Address::random(),
spender: Address::random(),
value: 100.into(),
nonce: 0.into(),
deadline: U256::MAX,
};
let permit_hash = permit.encode_eip712().unwrap();
println!("Permit hash: 0x{}", hex::encode(permit_hash));
}